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Bifold Door Repair - How to Fix a Sticky Bifold Door If your bifold doors sag instead of smoothly opening and close, the problem can usually be fixed by a few easy steps. Here's how. The addition of carpet or changing the flooring material often causes bifold closet doors to scratch the floor. The bottom pivot adjustment can be used to raise the door. It is important to keep the hardware in good condition by getting rid of dust, dirt and other debris. Versatility A bifold door